Now I see why people moved from Norway to Iceland and untill this day have benefitted from snatching ladies from other countries for crossbreeding purpouses

Anyway, north up, the Soviets already were in Norway in WW2. They pretty much know how an advance would have to be, - if not through Sweden as well, and that means Finland also, - 3 countries with armies which are designed for defense only. So, on we go:
"Angus, a tactical nuke has a very low yield; we're talking kilotons, and sometimes less than a kiloton. The blast radius is very limited, and therefore they are only used against specific targets like airbases and such. Radiation is still bad though since most of these weapons are fission devices"
I know. Even small enough to be fired from a cannon, and used in a subhunt, etc etc. Sorry that I got mixed up in the defcon number, but I think the point is worth looking into, - how fast does the defcon count, how fast were the Soviets ready to open the countdown in tactical warfare? same goes to the other side of course, - especially in the submarine warfare.
Then as a sidenote...."only" a kilotonne is 100 times as powerful as the grand slam, yet only 5-10% of Hiroshima/Nagasaki blast power. Then we are also into the business of at what depth the detonation occurs.
P.S. Nilsen, are you truly from Sörland? I was around there from Oslo, Kristianssand, Vanse/Lista, and along all the way to Sandnes...many years ago.